python - keras load_model raise error when executed a second time -


i'm making website, , sometimes, calls keras neural network. have function looks : 

def network(campaign):     keras.models import load_model     model = load_model("sunshade/neural_network/model.h5") #the line fail second time call      #loading data      label = model.predict(images, batch_size = 128, verbose = 1)      #some unrelated code...

this code works fine when execute first time, when try run second time, fails wieh error :

exception in thread thread-31: traceback (most recent call last):   file "/usr/lib/python3.4/dist-packages/tensorflow/python/client/session.py", line 930, in _run     allow_operation=false)   file "/usr/lib/python3.4/dist-packages/tensorflow/python/framework/ops.py", line 2414, in as_graph_element     return self._as_graph_element_locked(obj, allow_tensor, allow_operation)   file "/usr/lib/python3.4/dist-packages/tensorflow/python/framework/ops.py", line 2493, in _as_graph_element_locked     raise valueerror("tensor %s not element of graph." % obj) valueerror: tensor tensor("placeholder_3:0", shape=(32,), dtype=float32) not element of graph.  during handling of above exception, exception occurred:  traceback (most recent call last):   file "/usr/lib64/python3.4/threading.py", line 920, in _bootstrap_inner     self.run()   file "/usr/lib64/python3.4/threading.py", line 868, in run     self._target(*self._args, **self._kwargs)   file "/home/ec2-user/spynet/poc/sunshadedetector/sunshade/models.py", line 46, in launch_network     network(self)   file "/home/ec2-user/spynet/poc/sunshadedetector/sunshade/neural_network/network.py", line 27, in network     model = load_model("sunshade/neural_network/model.h5")   file "/usr/local/lib64/python3.4/site-packages/keras/models.py", line 236, in load_model     topology.load_weights_from_hdf5_group(f['model_weights'], model.layers)   file "/usr/local/lib64/python3.4/site-packages/keras/engine/topology.py", line 3048, in load_weights_from_hdf5_group     k.batch_set_value(weight_value_tuples)   file "/usr/local/lib64/python3.4/site-packages/keras/backend/tensorflow_backend.py", line 2188, in batch_set_value     get_session().run(assign_ops, feed_dict=feed_dict)   file "/usr/lib/python3.4/dist-packages/tensorflow/python/client/session.py", line 778, in run     run_metadata_ptr)   file "/usr/lib/python3.4/dist-packages/tensorflow/python/client/session.py", line 933, in _run     + e.args[0]) typeerror: cannot interpret feed_dict key tensor: tensor tensor("placeholder_3:0", shape=(32,), dtype=float32) not element of graph.

by way, use django website part, don't think it's related. there must kind of thing need closed, or re-initialized... tried use tf.session(), , tf.reset_default_graph,but still errors. have restart django server each time want use function.

do have idea ? in worst case scenario, may can make model singleton, don't have reload each time...


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